const get = require('lodash/get');
const each = require('lodash/each');
const filter = require('lodash/filter');
const find = require('lodash/find');
const decomment = require('decomment');
const crypto = require('node:crypto');
const fs = require('node:fs');
const { mergeHeaders, mergeScripts, mergeVars, mergeAuth, getTreePathFromCollectionToItem } = require('../utils/collection');
const path = require('node:path');
const { isLargeFile } = require('../utils/filesystem');
const { getFormattedOauth2Credentials } = require('../utils/oauth2');

const STREAMING_FILE_SIZE_THRESHOLD = 20 * 1024 * 1024; // 20MB

const prepareRequest = async (item = {}, collection = {}) => {
  const request = item?.request;
  const brunoConfig = collection.draft?.brunoConfig ? get(collection, 'draft.brunoConfig', {}) : get(collection, 'brunoConfig', {});
  const collectionPath = collection?.pathname;
  const headers = {};
  let contentTypeDefined = false;

  const scriptFlow = brunoConfig?.scripts?.flow ?? 'sandwich';
  const requestTreePath = getTreePathFromCollectionToItem(collection, item);
  if (requestTreePath && requestTreePath.length > 0) {
    mergeHeaders(collection, request, requestTreePath);
    mergeScripts(collection, request, requestTreePath, scriptFlow);
    mergeVars(collection, request, requestTreePath);
    mergeAuth(collection, request, requestTreePath);
  }

  each(get(request, 'headers', []), (h) => {
    if (h.enabled) {
      headers[h.name] = h.value;
      if (h.name.toLowerCase() === 'content-type') {
        contentTypeDefined = true;
      }
    }
  });

  let axiosRequest = {
    method: request.method,
    url: request.url,
    headers: headers,
    name: item.name,
    tags: item.tags || [],
    pathParams: request.params?.filter((param) => param.type === 'path'),
    settings: item.settings,
    responseType: 'arraybuffer'
  };

  const collectionRoot = collection?.draft?.root || collection?.root || {};
  const collectionAuth = get(collectionRoot, 'request.auth');
  if (collectionAuth && request.auth?.mode === 'inherit') {
    if (collectionAuth.mode === 'basic') {
      axiosRequest.basicAuth = {
        username: get(collectionAuth, 'basic.username'),
        password: get(collectionAuth, 'basic.password')
      };
    }

    if (collectionAuth.mode === 'bearer') {
      axiosRequest.headers['Authorization'] = `Bearer ${get(collectionAuth, 'bearer.token', '')}`;
    }

    if (collectionAuth.mode === 'apikey') {
      if (collectionAuth.apikey?.placement === 'header') {
        axiosRequest.headers[collectionAuth.apikey?.key] = collectionAuth.apikey?.value;
      }

      if (collectionAuth.apikey?.placement === 'queryparams') {
        if (axiosRequest.url && collectionAuth.apikey?.key) {
          try {
            const urlObj = new URL(request.url);
            urlObj.searchParams.set(collectionAuth.apikey?.key, collectionAuth.apikey?.value);
            axiosRequest.url = urlObj.toString();
          } catch (error) {
            console.error('Invalid URL:', request.url, error);
          }
        }
      }
    }

    if (collectionAuth.mode === 'digest') {
      axiosRequest.digestConfig = {
        username: get(collectionAuth, 'digest.username'),
        password: get(collectionAuth, 'digest.password')
      };
    }

    if (collectionAuth.mode === 'oauth2') {
      const grantType = get(collectionAuth, 'oauth2.grantType');

      if (grantType === 'client_credentials') {
        axiosRequest.oauth2 = {
          grantType,
          accessTokenUrl: get(collectionAuth, 'oauth2.accessTokenUrl'),
          refreshTokenUrl: get(collectionAuth, 'oauth2.refreshTokenUrl'),
          clientId: get(collectionAuth, 'oauth2.clientId'),
          clientSecret: get(collectionAuth, 'oauth2.clientSecret'),
          scope: get(collectionAuth, 'oauth2.scope'),
          credentialsPlacement: get(collectionAuth, 'oauth2.credentialsPlacement'),
          credentialsId: get(collectionAuth, 'oauth2.credentialsId'),
          tokenPlacement: get(collectionAuth, 'oauth2.tokenPlacement'),
          tokenHeaderPrefix: get(collectionAuth, 'oauth2.tokenHeaderPrefix'),
          tokenQueryKey: get(collectionAuth, 'oauth2.tokenQueryKey'),
          autoFetchToken: get(collectionAuth, 'oauth2.autoFetchToken'),
          autoRefreshToken: get(collectionAuth, 'oauth2.autoRefreshToken'),
          additionalParameters: get(collectionAuth, 'oauth2.additionalParameters', { authorization: [], token: [], refresh: [] })
        };
      } else if (grantType === 'password') {
        axiosRequest.oauth2 = {
          grantType,
          accessTokenUrl: get(collectionAuth, 'oauth2.accessTokenUrl'),
          refreshTokenUrl: get(collectionAuth, 'oauth2.refreshTokenUrl'),
          username: get(collectionAuth, 'oauth2.username'),
          password: get(collectionAuth, 'oauth2.password'),
          clientId: get(collectionAuth, 'oauth2.clientId'),
          clientSecret: get(collectionAuth, 'oauth2.clientSecret'),
          scope: get(collectionAuth, 'oauth2.scope'),
          credentialsPlacement: get(collectionAuth, 'oauth2.credentialsPlacement'),
          credentialsId: get(collectionAuth, 'oauth2.credentialsId'),
          tokenPlacement: get(collectionAuth, 'oauth2.tokenPlacement'),
          tokenHeaderPrefix: get(collectionAuth, 'oauth2.tokenHeaderPrefix'),
          tokenQueryKey: get(collectionAuth, 'oauth2.tokenQueryKey'),
          autoFetchToken: get(collectionAuth, 'oauth2.autoFetchToken'),
          autoRefreshToken: get(collectionAuth, 'oauth2.autoRefreshToken'),
          additionalParameters: get(collectionAuth, 'oauth2.additionalParameters', { authorization: [], token: [], refresh: [] })
        };
      }
    }
    if (collectionAuth.mode === 'awsv4') {
      axiosRequest.awsv4config = {
        accessKeyId: get(collectionAuth, 'awsv4.accessKeyId'),
        secretAccessKey: get(collectionAuth, 'awsv4.secretAccessKey'),
        sessionToken: get(collectionAuth, 'awsv4.sessionToken'),
        service: get(collectionAuth, 'awsv4.service'),
        region: get(collectionAuth, 'awsv4.region'),
        profileName: get(collectionAuth, 'awsv4.profileName')
      };
    }

    if (collectionAuth.mode === 'ntlm') {
      axiosRequest.ntlmConfig = {
        username: get(collectionAuth, 'ntlm.username'),
        password: get(collectionAuth, 'ntlm.password'),
        domain: get(collectionAuth, 'ntlm.domain')
      };
    }

    if (collectionAuth.mode === 'wsse') {
      const username = get(collectionAuth, 'wsse.username', '');
      const password = get(collectionAuth, 'wsse.password', '');

      const ts = new Date().toISOString();
      const nonce = crypto.randomBytes(16).toString('hex');

      // Create the password digest using SHA-1 as required for WSSE
      const hash = crypto.createHash('sha1');
      hash.update(nonce + ts + password);
      const digest = Buffer.from(hash.digest('hex').toString('utf8')).toString('base64');

      // Construct the WSSE header
      axiosRequest.headers[
        'X-WSSE'
      ] = `UsernameToken Username="${username}", PasswordDigest="${digest}", Nonce="${nonce}", Created="${ts}"`;
    }

    console.log('axiosRequest', axiosRequest);
  }

  if (request.auth && request.auth.mode !== 'inherit') {
    if (request.auth.mode === 'basic') {
      axiosRequest.basicAuth = {
        username: get(request, 'auth.basic.username'),
        password: get(request, 'auth.basic.password')
      };
    }

    if (request.auth.mode === 'awsv4') {
      axiosRequest.awsv4config = {
        accessKeyId: get(request, 'auth.awsv4.accessKeyId'),
        secretAccessKey: get(request, 'auth.awsv4.secretAccessKey'),
        sessionToken: get(request, 'auth.awsv4.sessionToken'),
        service: get(request, 'auth.awsv4.service'),
        region: get(request, 'auth.awsv4.region'),
        profileName: get(request, 'auth.awsv4.profileName')
      };
    }

    if (request.auth.mode === 'ntlm') {
      axiosRequest.ntlmConfig = {
        username: get(request, 'auth.ntlm.username'),
        password: get(request, 'auth.ntlm.password'),
        domain: get(request, 'auth.ntlm.domain')
      };
    }

    if (request.auth.mode === 'bearer') {
      axiosRequest.headers['Authorization'] = `Bearer ${get(request, 'auth.bearer.token', '')}`;
    }

    if (request.auth.mode === 'wsse') {
      const username = get(request, 'auth.wsse.username', '');
      const password = get(request, 'auth.wsse.password', '');

      const ts = new Date().toISOString();
      const nonce = crypto.randomBytes(16).toString('hex');

      // Create the password digest using SHA-1 as required for WSSE
      const hash = crypto.createHash('sha1');
      hash.update(nonce + ts + password);
      const digest = Buffer.from(hash.digest('hex').toString('utf8')).toString('base64');

      // Construct the WSSE header
      axiosRequest.headers[
        'X-WSSE'
      ] = `UsernameToken Username="${username}", PasswordDigest="${digest}", Nonce="${nonce}", Created="${ts}"`;
    }

    if (request.auth.mode === 'digest') {
      axiosRequest.digestConfig = {
        username: get(request, 'auth.digest.username'),
        password: get(request, 'auth.digest.password')
      };
    }

    if (request.auth.mode === 'oauth2') {
      const grantType = get(request, 'auth.oauth2.grantType');

      if (grantType === 'client_credentials') {
        axiosRequest.oauth2 = {
          grantType: grantType,
          accessTokenUrl: get(request, 'auth.oauth2.accessTokenUrl'),
          refreshTokenUrl: get(request, 'auth.oauth2.refreshTokenUrl'),
          clientId: get(request, 'auth.oauth2.clientId'),
          clientSecret: get(request, 'auth.oauth2.clientSecret'),
          scope: get(request, 'auth.oauth2.scope'),
          credentialsPlacement: get(request, 'auth.oauth2.credentialsPlacement'),
          credentialsId: get(request, 'auth.oauth2.credentialsId'),
          tokenPlacement: get(request, 'auth.oauth2.tokenPlacement'),
          tokenHeaderPrefix: get(request, 'auth.oauth2.tokenHeaderPrefix'),
          tokenQueryKey: get(request, 'auth.oauth2.tokenQueryKey'),
          autoFetchToken: get(request, 'auth.oauth2.autoFetchToken'),
          autoRefreshToken: get(request, 'auth.oauth2.autoRefreshToken'),
          additionalParameters: get(request, 'auth.oauth2.additionalParameters', { authorization: [], token: [], refresh: [] })
        };
      } else if (grantType === 'password') {
        axiosRequest.oauth2 = {
          grantType: grantType,
          accessTokenUrl: get(request, 'auth.oauth2.accessTokenUrl'),
          refreshTokenUrl: get(request, 'auth.oauth2.refreshTokenUrl'),
          username: get(request, 'auth.oauth2.username'),
          password: get(request, 'auth.oauth2.password'),
          clientId: get(request, 'auth.oauth2.clientId'),
          clientSecret: get(request, 'auth.oauth2.clientSecret'),
          scope: get(request, 'auth.oauth2.scope'),
          credentialsPlacement: get(request, 'auth.oauth2.credentialsPlacement'),
          credentialsId: get(request, 'auth.oauth2.credentialsId'),
          tokenPlacement: get(request, 'auth.oauth2.tokenPlacement'),
          tokenHeaderPrefix: get(request, 'auth.oauth2.tokenHeaderPrefix'),
          tokenQueryKey: get(request, 'auth.oauth2.tokenQueryKey'),
          autoFetchToken: get(request, 'auth.oauth2.autoFetchToken'),
          autoRefreshToken: get(request, 'auth.oauth2.autoRefreshToken'),
          additionalParameters: get(request, 'auth.oauth2.additionalParameters', { authorization: [], token: [], refresh: [] })
        };
      }
    }

    if (request.auth.mode === 'apikey') {
      if (request.auth.apikey?.placement === 'header') {
        axiosRequest.headers[request.auth.apikey?.key] = request.auth.apikey?.value;
      }

      if (request.auth.apikey?.placement === 'queryparams') {
        if (axiosRequest.url && request.auth.apikey?.key) {
          try {
            const urlObj = new URL(request.url);
            urlObj.searchParams.set(request.auth.apikey?.key, request.auth.apikey?.value);
            axiosRequest.url = urlObj.toString();
          } catch (error) {
            console.error('Invalid URL:', request.url, error);
          }
        }
      }
    }
  }

  request.body = request.body || {};

  if (request.body.mode === 'json') {
    if (!contentTypeDefined) {
      axiosRequest.headers['content-type'] = 'application/json';
    }
    try {
      axiosRequest.data = decomment(request?.body?.json);
    } catch (error) {
      axiosRequest.data = request?.body?.json;
    }
  }

  if (request.body.mode === 'text') {
    if (!contentTypeDefined) {
      axiosRequest.headers['content-type'] = 'text/plain';
    }
    axiosRequest.data = request.body.text;
  }

  if (request.body.mode === 'xml') {
    if (!contentTypeDefined) {
      axiosRequest.headers['content-type'] = 'application/xml';
    }
    axiosRequest.data = request.body.xml;
  }

  if (request.body.mode === 'sparql') {
    if (!contentTypeDefined) {
      axiosRequest.headers['content-type'] = 'application/sparql-query';
    }
    axiosRequest.data = request.body.sparql;
  }

  if (request.body.mode === 'file') {
    if (!contentTypeDefined) {
      axiosRequest.headers['content-type'] = 'application/octet-stream'; // Default headers for binary file uploads
    }

    const bodyFile = find(request.body.file, (param) => param.selected);
    if (bodyFile) {
      let { filePath, contentType } = bodyFile;

      axiosRequest.headers['content-type'] = contentType;

      if (filePath) {
        if (!path.isAbsolute(filePath)) {
          filePath = path.join(collectionPath, filePath);
        }

        try {
          // Large files can cause "JavaScript heap out of memory" errors when loaded entirely into memory.
          if (isLargeFile(filePath, STREAMING_FILE_SIZE_THRESHOLD)) {
            // For large files: Use streaming to avoid memory issues
            axiosRequest.data = fs.createReadStream(filePath);
          } else {
            // For smaller files: Use synchronous read for better performance
            axiosRequest.data = fs.readFileSync(filePath);
          }
        } catch (error) {
          console.error('Error reading file:', error);
        }
      }
    }
  }

  if (request.body.mode === 'formUrlEncoded') {
    if (!contentTypeDefined) {
      axiosRequest.headers['content-type'] = 'application/x-www-form-urlencoded';
    }
    const enabledParams = filter(request.body.formUrlEncoded, (p) => p.enabled);
    axiosRequest.data = enabledParams;
  }

  if (request.body.mode === 'multipartForm') {
    axiosRequest.headers['content-type'] = 'multipart/form-data';
    const enabledParams = filter(request.body.multipartForm, (p) => p.enabled);
    axiosRequest.data = enabledParams;
  }

  if (request.body.mode === 'graphql') {
    const graphqlQuery = {
      query: get(request, 'body.graphql.query'),
      variables: JSON.parse(decomment(get(request, 'body.graphql.variables') || '{}'))
    };
    if (!contentTypeDefined) {
      axiosRequest.headers['content-type'] = 'application/json';
    }
    axiosRequest.data = graphqlQuery;
  }

  if (request.script) {
    axiosRequest.script = request.script;
  }

  if (request.tests) {
    axiosRequest.tests = request.tests;
  }

  axiosRequest.vars = request.vars;
  axiosRequest.collectionVariables = request.collectionVariables;
  axiosRequest.folderVariables = request.folderVariables;
  axiosRequest.requestVariables = request.requestVariables;
  axiosRequest.oauth2CredentialVariables = getFormattedOauth2Credentials();

  return axiosRequest;
};

module.exports = prepareRequest;
